#ifdef __cplusplus
extern "C"{
#endif

#ifndef __XS_CTYPE_H__
#define __XS_CTYPE_H__
/*
 * NOTE! This ctype does not handle EOF like the standard C
 * library is required to.
 */

#define _U	0x01	/* upper */
#define _L	0x02	/* lower */
#define _D	0x04	/* digit */
#define _C	0x08	/* cntrl */
#define _P	0x10	/* punct */
#define _S	0x20	/* white space (space/lf/tab) */
#define _X	0x40	/* hex digit */
#define _SP	0x80	/* hard space (0x20) */


extern const unsigned char _xs_ctype[];

#define __ismask(x) (_xs_ctype[(int)(unsigned char)(x)])

#define xs_isalnum(c)	((__ismask(c)&(_U|_L|_D)) != 0)
#define xs_isalpha(c)	((__ismask(c)&(_U|_L)) != 0)
#define xs_iscntrl(c)	((__ismask(c)&(_C)) != 0)
#define xs_isdigit(c)	((__ismask(c)&(_D)) != 0)
#define xs_isgraph(c)	((__ismask(c)&(_P|_U|_L|_D)) != 0)
#define xs_islower(c)	((__ismask(c)&(_L)) != 0)
#define xs_isprint(c)	((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
#define xs_ispunct(c)	((__ismask(c)&(_P)) != 0)
/* Note: isspace() must return false for %NUL-terminator */
#define xs_isspace(c)	((__ismask(c)&(_S)) != 0)
#define xs_isupper(c)	((__ismask(c)&(_U)) != 0)
#define xs_isxdigit(c)	((__ismask(c)&(_D|_X)) != 0)

#define xs_isascii(c) (((unsigned char)(c))<=0x7f)
#define xs_toascii(c) (((unsigned char)(c))&0x7f)

static inline unsigned char __tolower(unsigned char c)
{
	if (xs_isupper(c))
		c -= 'A'-'a';
	return c;
}

static inline unsigned char __toupper(unsigned char c)
{
	if (xs_islower(c))
		c -= 'a'-'A';
	return c;
}

#define xs_tolower(c) __tolower(c)
#define xs_toupper(c) __toupper(c)

#endif

#ifdef __cplusplus
}
#endif
